Housing for mounting a container on an injection pen, assembly forming an injectable product reservoir for an injection pen and injection pen equipped with such an assembly

Abstract

The housing for mounting an elongate-shaped container on an injection pen comprises an elongate-shaped body which extends along a longitudinal axis (X 30 ) and which defines an interior volume (V 32 ) for fully receiving the container. The body is provided, on the outside of a first axial end, with at least one first mechanical member for attaching a needle. The body is further provided, in the vicinity of a second axial end opposite the first axial end, with at least one second mechanical member for attaching the housing onto an injection pen. The housing further comprises, in the vicinity of the first axial end thereof, at least one third mechanical member for irreversibly locking a container in position, fully contained in the interior volume (V 32 ) of the body of the housing. Said third locking member is formed by an elastically deformable tab intended to ensure locking of the container in position in the interior volume (V 32 ) of the body of the housing, by axially retaining a flange of the container.

The invention claimed is: 
     
       1. A housing for mounting an elongated container on an injection pen, this mounting housing comprising an elongated body that extends along a longitudinal axis and that defines an inner volume for receiving the container fully, while the body is provided, on the outside of a first axial end, with at least one first mechanical member for attaching a needle and, in the vicinity of a second axial end opposite the first axial end, with at least one second mechanical member for attaching the housing onto an injection pen; wherein
 the housing comprises, in the vicinity of its first axial end, at least one third mechanical member for irreversibly locking a container in position, fully contained in the inner volume of the body, and 
 the third member is an elastically deformable tab of the housing, which is in a single piece with the body wherein when the third member is in an unstressed configuration the tab ensures irreversible locking of the container in position in the inner volume of the body of the housing, by axially retaining a flange of the container. 
 
     
     
       2. The housing according to  claim 1 , wherein, in the unstressed configuration, the tab extends at a radial distance from the longitudinal axis smaller than half the inner diameter of the first axial end. 
     
     
       3. The housing according to  claim 1 , wherein the tab comprises an edge opposite the second axial end of the housing and that is intended to axially and irreversibly lock the flange of the container. 
     
     
       4. The housing according to  claim 3 , wherein the tab is surrounded by a U-shaped cutout with a flat bottom, the bottom of which delimits the edge of the tab opposite the second axial end. 
     
     
       5. The housing according to  claim 1 , wherein it comprises two diametrically opposite tabs relative to the longitudinal axis. 
     
     
       6. The housing according to  claim 1 , wherein the tab is configured to be pushed radially back toward the outside of the first axial end by part of a container during irreversible mounting in the housing. 
     
     
       7. The housing according to  claim 1 , wherein the body is at least partially made from a transparent material. 
     
     
       8. The housing according to  claim 1 , wherein:
 the first mechanical fastening member comprises a thread and/or a bayonet locking relief, and/or 
 the second mechanical fastening member comprises a thread, a tapping and/or a bayonet locking relief. 
 
     
     
       9. An assembly forming an injectable product reservoir for an injection pen, wherein it further comprises a housing according to  claim 1  and wherein the container is fully housed in the inner volume of the body of the housing. 
     
     
       10. The assembly according to  claim 9 , wherein the second end extends, along the longitudinal axis of the body and over a nonzero distance, past the container. 
     
     
       11. The assembly according to  claim 9 , wherein the container is equipped with a flange, which surrounds a mouth of the container, and wherein the elastically deformable tab is positioned across from, or bearing against, an axial surface of the flange, oriented opposite the mouth of the container. 
     
     
       12. The assembly according to  claim 9 , wherein the container is equipped with a stopper and a cap surrounding the stopper, which are inserted into the first axial end of the housing. 
     
     
       13. The assembly according to  claim 9 , wherein the housing is provided with a recess for receiving a stopper independently of the container, while the container has no cap surrounding the stopper. 
     
     
       14. The assembly according to  claim 9 , wherein the elongated container and the housing are disposable after use. 
     
     
       15. An injection pen, intended to be used to inject an active ingredient into the body of a patient and comprising:
 a base intended to be held by a user, 
 a removable injectable product reservoir, 
 
       wherein the removable injectable product reservoir is formed by an assembly according to  claim 9 , and wherein the second mechanical member of the body of the housing is engaged with a complementary mechanical member arranged on the base.